Re: pygtk: transparent pixmaps

[David Nečas (Yeti) <yeti physics muni cz>]

On Wed, Jun 07, 2006 at 11:36:35AM +0200, Jachym Cepicky wrote:
> I try to script some app. using pygtk. One of the tasks is to draw some
> data on the image background. I would like to use approach like follows:
>
>     pixbuf =  gtk.gdk.pixbuf_new_from_file("tmp.ppm")
>     pixmap = gtk.gdk.Pixmap(widget.window, width, height)
>
>     for line in lines:
>         pixmap.draw_line(line[x], line[y]...)
>
>     drawingarea.window.draw_pixbuf(...,pixbuf,0,0,0,0,.....)
>     drawingarea.window.draw_drawable(..., pixmap, ....)
>
> Result is, the background image (pixbuf) appears, but only shortly, than
> it is overlaid by *black* (non-transparent) pixmap.
>
> So my question: How to perform task like this with python?

Scrap the pixmap and just draw the lines on
drawingarea.window (after the pixbuf, of course)?

Yeti


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